Attachment for punching-machines.



R. L. HIBBARD.

ATTACHMENT FOR PUNGHING MACHINES.

APPLICATION FILED MAY 27, 1912.

L089217, l Patented Mar. 3, 1914.

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WITNESSES ,l

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UNITED STATES PATENT OFFICE.

ROBERT L. IIIBBARD, 0F SEWICKLEY, PENNSYLVANIA, ASSIGNOR TO RITER-CONLEY MANUFACTURING COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A CRPORATION 0F NEW JERSEY.

ATTACHMENT FOR PUNCHING-MACHINES.

To all wh-0m t may concern:

Be it known that I, ROBERT L. HIBBARD, of Sewickley, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Attachments for Punching-ll/Iachines, of which the following is a specification.

An object of the present invention is to provide, in connection with a metal punching` machine, automatically operable means for feeding a work conveying table forward intermittently and through predetermined distances, and for automatically controlling the operation of the punch or punches.

A further object of the present invention is to provide new and improved automatically operable means for controlling the operation of the punch and for advancing a table, said means being designed to coperate with a power shaft common to the punch and table operating mechanisms, and preferably, a continuously operating shaft.

In the accompanying drawing, which illustrates an application of my invention, Figure 1 is a part side elevational and a part longitudinal sectional view of a punching machine embodying my invention; Fig. 2, a part elevational view and a part vertical sectional view, the section being taken on line II--II of Fig. 1 looking in the direction of the arrows; Fig. 3, an enlarged side elevational view of a portion of the work table actuating means; Fig. t, a sectional view of the same, the section being taken on line IV-IV of Fig. 3 looking in the direction of the arrows; and Fig. 5, a part plan and a part horizontal section of the portion of the table actuating mechanism shown by Fig. 3.

In the drawing, I have shown only a single punch mechanism 1. In practice, however, two punches may be employed located on opposite sides of the work conveying table, which latter extends between the punches. As illustrated, the table 2 is mounted on a track 3, said track comprising two vertical longitudinally extending beams 41- and a flat plate member 5 mounted on the upper ends of the beams. The table is supported on the track by means of wheels 6. Said table is provided with downwardly extending side track members 7 designed to mesh with gears 8 mounted on a shaft 9 which extends through the vertical members Specification of Letters Patent.

Application filed May 27', 1912.

Patented Mar. 3, 1914.

Serial No. 699,877.

of the track and has its bearings in supports 10 and 11.

12 designates a rack member mounted on the track, preferably centrally thereof, and designed to coperate with a member 13, the latter being pivotally supported on a shaft 14- extending across the table. Shaft 9, as illustrated, is provided at one end with a hand operating wheel 15 which may be employed to move the table along the track.

16 designates the main drive shaft designed to extend across the machine from one punch housing to the other, and, as clearly shown by Fig. 2, projects through a bearing 17 of a portion or an extension of a punch housing, and has its outer end supported in an outboard bearing 18, this latter bearing is carried on an upright or frame 19 extending upwardly from a suitable foundation, and 20 designates a pinion keyed to the projecting end of said shaft 16. Power shaft 16 is preferably a continuously operating shaft, being driven by suitable means, not shown.

21 designa-tes a punch actuating shaft connected with t-he shaft 16 by means of a gear 22 and pinion 23. Mounted on said punch actuating shaft 21, I provide a clutch device 24.- operable to effect a connection between shafts 21 and 16. Pinion 2O is designed to mesh with a gear wheel 25, said gear wheel 25, together with a cam 26, are mounted on an idler or trunnion 27 secured to the upright member or frame 19.

The automatically operable means for moving the table forward, which means are actuated by the drive shaft 16, include the cam 26, a lever 28 fulcrumed at 29 and provided with a counter weight 30. The upper end of lever 23 is provided with a cam roller 31, and by means of the weight 30, this roller is always maintained in contact with the cam 26. Lever 2S is slotted as shown at 32, and connected with said lever is an adjustable connecting rod 33 adjustably secured at one end to the lever 28 by means of a pin 34. The opposite end of the connecting rod 33 engages a pin 35 secured in an oscillating frame 36, said frame comprising two spaced members 37, 38, and a curved bar 39, said member 37 being provided with notches 40. The curved bar is connected tween the bar and member 37 and the arm is secured to the respective parts 39 and 37 by a pin 42 and a bolt 43. A pawl 44 is carried on arm 41 and is adapted to engage the notches 40 to raise a series of dogs 45 carried by the frame 36 out of engagement with the teeth of a gear wheel 46, as particularly shown by F ig. 3. F rame 36 is loosely mounted on shaft 9, while the gear wheel 46 is rigid therewith, this latter wheel extends upwardly between members 37 and 38 of the movable frame and is adapted to be engaged by the dogs as frame 36 is moved forward by the coperative action of the lever 28 and the cam 26.

Gear wheel 46 being rigidly mounted upon shaft 9 will, as said Wheel is rotated by the actuating mechanism just described, impart a rotative movement to shaft 9 and to the gears S mounted thereon. Gears S, being in engagement with the rack 7 of the carriage, will move the carriage forward a predetermined distance depending, of course, upon the size of the cam and the position of the connecting rod 33 in the slot of the lever 2S. After the parts have been moved forward, as just described, by the action of the cam, the weighted arm carrying weight 30 will cause lever 28 and the frame 36 carrying the dogs 45 to move backward into position to again coact with the gear 46.

In order to prevent undue oscillation of the long work carrying table 2, I secure to the rear end thereof a weight 47 by means of a rope 48 passing over pulleys 49 and 50; weight 47 being located in a suitable pit as indicated at 51. |This weight 47 coperates with the rack 12 and member 13 to draw said member 13 back against a tooth of the rack 12. rlhese means not only prevent undue oscillation of the table, but insure an accurate spacing of the holes to be punched in the plate.

In addition to providing the automatically operable means for advancing the carriage and the work to be operated upon to the punch or punches, I provide automatically operable means for shifting the clutch 24 of punch actuating shaft 21 to control the punching operations when the work has been carried into the desired position for punching, and, as illustrated, these means include a slotted connecting rod 52 having one end secured by a pin 53 adjustably mounted in a slot 54 of the ge'ar wheel 25. Rod 52 extends downwardly through a trunnionbox 55 and has its lower end threaded to receive a nut 56. Surrounding the rod and disposed between the nut 56 and the box 55, provide a spring 57 designed to act as a take-up for pin 53 after the clutch 24 is in mesh. Connected with rod 52 is an arm 58 having one end rigid with a shaft 59. Shaft 59 is further provided with an arm 60 by which shaft 59 is connected with a bell crank lever 61 by means of an interposed connecting rod 62. Bell crank 61 is provided with a spring 63 designed to slide said clutch out of operative engagement after the pull on the bell crank lever ceases. In order to throw the punch operating mechanism out of operation, I provide shaft 59 with a clutch 64 operable by a handle 65.

What I claim is 1. The combination with a punch, of a table, automatically operable means for moving the table forward and for operating the punch including a common power shaft and coperating elements disposed between the shaft and table and other coperating elements between the punch and shaft, whereby said table and said punch may be operated independently of each other, but from the same power shaft.

2. The combination with a punch, of a table, automatically operable means for moving the table forward a predetermined distance and for operating the punch at predetermined intervals including a common power shaft and coperating elements disposed between the shaft and table and other coperating elements between the punch and shaft, whereby said table and said punch may be operated independently of each other, but from the same power shaft.

3. The combination in a punching and work feeding machine of a common power shaft for operating the work table feeding mechanism and the punch, means interposed between said shaft and each of said mechanisms for operating one independently of the other, and a variable throw rod interposed between the power shaft and the table feed for intermittently advancing said table any predetermined distance, substantially as set forth.

4. The combination with a punch, of a table, a common power shaft for said punch and table, automatically operable means c0- acting with the power shaft for controlling the operation of the punch, and automatically operable means coacting with the common power shaft for moving the table forward including a cam, a lever coacting with the cam, and a variable throw means connecting the table with the lever.

5. The combination with a punch, of a table, a common power shaft for said punch and table, automatically operable means coacting with the power shaft for controlling the operation of the punch, and automatically operable means for intermittently moving the table forward a predetermined distance coacting with the common power shaft and including a cam, and a variable throw operable means connected with the table and actuated by the cam.

6. The combination with a punching machine, of a work conveying table, a toothed ROBERT L. HIBBARD.

rack on the table, a shaft having a pinion meshing with the rack, a common drive shaft, and automatically operable means clisposed between the shafts for movingthe table forward including a gear rigid with the first mentioned Shaft, an oscillating frame, a dog carried by' the frame and eoaeting with the gear, an oscillating lever, a variable Witnesses:

W. G. DOOLITTLE, F. E. GAIN-IER.

Gopiee oithis patent may ne obtained for ve cents each, by addressing the Sommissioner of Patenti, Washington, D. C. 

